/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package sg.edu.nus.iss.pacman.servlet;

import java.io.IOException;
import sg.edu.nus.iss.pacman.constant.Constants;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import sg.edu.nus.iss.pacman.service.MapService;
import sg.edu.nus.iss.pacman.service.impl.MapServiceImpl;

/**
 *
 * @author Tabiul Mahmood
 */
public class DownloadMapServlet extends HttpServlet
{
    /** 
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException
    {
        String downloadURL = request.getRequestURI();
        String mapName = request.getParameter("mapName");
        String url = request.getContextPath() + Constants.MAP_DOWNLOAD_URL;
        if (downloadURL.equalsIgnoreCase(url) && mapName != null && !mapName.isEmpty())
        {
            response.setContentType("text/xml;charset=UTF-8");
            MapService mapService = new MapServiceImpl();
            ServletOutputStream out = response.getOutputStream();
            try
            {
                out.write(mapService.getMap(mapName));
                response.setStatus(response.SC_OK);
            }
            catch (Exception ex)
            {
                ex.printStackTrace();
                response.setStatus(response.SC_SERVICE_UNAVAILABLE);
            }
            finally
            {
                out.close();
            }
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
     * Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException
    {
        processRequest(request, response);
    }

    /** 
     * Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException
    {
        processRequest(request, response);
    }

    /** 
     * Returns a short description of the servlet.
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo()
    {
        return "Returns the Map based upon the mapName";
    }// </editor-fold>
}
